That comic was released on April 6th 2015. So some forethought.
Woah, I didn't remember that XKCD called iOS and OSX combining.
People have been calling this since they acquired PA Semi, 11 or 12 years.
Have they really though? iOS has always shared the same underpinnings as OSX. Although much hyped with Big Sur, iOS features have dribbled into OSX since at least Lion (more than 10 years ago). They’re still distinct operating systems (thankfully IMO) and rather than unify, iPadOS is a distinct entity.
Well, he also called TinderOS, another thing that didn't happen.